WHO IS MILLI (abbreviated "m")?

1 mrad = 1/1000 rad or 1 rad = 1000 mrad

1 mrem = 1/1000 rem or 1 rem = 1000 mrem

1 mGy = 1/1000 Gy or 1 Gy = 1000 mGy

1 mSv = 1/1000 Sv or 1 Sv = 1000 mSv

So: 1 rem = 10 mSv

In SI units we use the following prefixes:

Pico p 10^-12

Nano n 10^-9

Micro μ 10^-6

Milli m 10^-3

Kilo k 10³

Mega M 10⁶

Notice that all of the prefixes increment by factors of 1000 or 10³

The use of other prefixes for SI units, such as centi (c) for 10^-2 is generally not allowed though there are a few exceptions because of common use – such as centimeter.

This means that you should not use cGy or cSv as units, though you may come across these units as simple substitutions for rad or rem. The units cGy and cSv are not accepted in refereed publications.